Hiiiiii,
Here is the timeline for my mom's super visa:
Application sent: December 25, 2012
Medical Request: Jan 13, 2013 (through email)
Medical done at Lahore: Feb 6, 2013 (It took so long because I was following a wrong procedure for taking medical appointment of my mom but thanks to @Xaideez for guiding me well)
In medical, apart from the regular examination, they did one additional test for diabetes because my mom is recent diabetes patient. Even I told them that her diabetes is totally controlled but still they did one extra test for knowing her diabetes history of last 3 months.
Overall, medical went smooth and fine.